Indexable Carbide Inserts For Spiral Planer Indexable Carbide Inserts For Spiral Planer,Carbide Threading Inserts,Carbide Cutter Inserts,Carbide Insert Fly Cutter SICHUAN TELOS NEW MATERIAL TECHNOLOGY CO., LTD , https://www.kenlarcutters.com
[China Instrument Network Instrument Research and Development] Recently, the research team led by Xie Pinhua at Anguang Institute has achieved significant progress in the development of a high-sensitivity detection system for atmospheric NO3 and N2O5. The study was recently published in *Optics Express*, a top-tier optics journal.
NO3 radicals play a crucial role in nighttime atmospheric chemistry as they act as the primary oxidant, reacting with volatile organic compounds (VOCs) to form organic nitrates. There is a thermal equilibrium between N2O5 and NO3 radicals, and the hydrolysis of N2O5 at night contributes to the formation of nitrate and ClNO2. These secondary pollutants are key components of urban air pollution. Accurate measurement of NO3 and N2O5 concentrations is essential for understanding the complex chemical processes that occur during nighttime.
Building on previous work in cavity ring-down spectroscopy (CRDS), Associate Researcher Hu Renzhi overcame challenges related to laser multi-path coupling and thermal cavity stability. This led to the development of a novel cavity ring-down system capable of simultaneously measuring NO3 and N2O5. Field tests were conducted in Beijing from June 2nd to June 22nd, 2017, marking the first time such measurements were made in urban areas of China. The instrument was also used to measure vertical profiles of these species during winter in Beijing, revealing that nighttime chemical reactions remain active even in cold conditions.
This advanced instrument can be adapted for high-sensitivity, real-time, and high-time-resolution monitoring of ambient NO3 and N2O5 across multiple platforms. It offers a powerful tool for atmospheric scientists studying chemical processes, secondary pollution mechanisms, and the behavior of reactive nitrogen species. The technology provides critical data support for understanding the dynamics of nighttime atmospheric chemistry.
The research was supported by the National Natural Science Foundation of China, the China National Institute of Metrology, and the Ministry of Science and Technology's special project.
(Original title: Anguang's new progress in simultaneous high-sensitivity detection of NO3 and N2O5 in the atmosphere)